Compare ADU zoning rules across 2 Virginia cities. Average ADU score: 6.0/10.
| City | Max Size | Setbacks | Permit Fees | Build Cost | 1BR Rent | Score |
|---|---|---|---|---|---|---|
| Alexandria | Footprint-based: the greater of 1/3 of the main house's floor area, or 350 sq ft (lots up to 2,500 sq ft) / 500 sq ft (larger lots) | 1 ft minimum; 3 ft if windows face property line | ADU permit ~$75-100; building-permit fees are valuation-based | $160,000-$320,000 | $1,650-$2,150/mo | 6/10 |
| Arlington | 35% of combined floor area up to 750 sq ft (45% up to 500 sq ft if the main dwelling is under 1,000 sq ft); new detached accessory buildings are also footprint-capped at 560 sq ft (R-5/R-6) or 650 sq ft (other R districts) | 5 ft (interior lots); 10 ft (corner lots) | $2,800-$4,500 | $170,000-$340,000 | $1,700-$2,200/mo | 6/10 |
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